#568911 mention {a} {b}... codes on man page

Package:
aptitude
Source:
aptitude
Description:
terminal-based package manager
Submitter:
Date:
2011-11-22 03:09:07 UTC
Severity:
wishlist
#568911#5
Date:
2010-02-08 18:47:45 UTC
From:
To:
"The following packages will be upgraded:
  dictionaries-common feh locales{b} mutt whois"

Please mention the meaning of the {a}, {b}... codes on the man page.
They are too hard to grep out of /usr/share/doc/aptitude.
#568911#10
Date:
2011-11-22 03:06:36 UTC
From:
To:
Yes please.  They're not defined in the builtin "Help -> User's Manual" either,
but they're used in the manual's example outputs.

Even the NEWS file only describes {a} (automatic), {u} (unused), and {p}
(purged), scattered around in the list.  There's no mention at all of
the {b} in your example.